import turtle

def draw_zero_with_turtle():
    window = turtle.Screen()
    window.bgcolor("white")
    pen = turtle.Turtle()
    pen.speed(1)
    
    # 绘制外圆
    pen.penup()
    pen.goto(0, -50)
    pen.pendown()
    pen.circle(50)
    
    # 隐藏画笔
    pen.hideturtle()
    turtle.done()

draw_zero_with_turtle()